diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java
index 366a08c8..c72bc9b4 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java
@@ -112,8 +112,11 @@ public final class BlockItemPacketRewriter1_20_2 extends ItemRewriter<Clientboun
         });
 
         protocol.registerServerbound(ServerboundPackets1_19_4.SET_BEACON_EFFECT, wrapper -> {
-            if (wrapper.passthrough(Type.BOOLEAN)) {
-                // Effects start at 1 before 1.20.2
+            // Effects start at 1 before 1.20.2
+            if (wrapper.passthrough(Type.BOOLEAN)) { // Primary effect
+                wrapper.write(Type.VAR_INT, wrapper.read(Type.VAR_INT) - 1);
+            }
+            if (wrapper.passthrough(Type.BOOLEAN)) { // Secondary effect
                 wrapper.write(Type.VAR_INT, wrapper.read(Type.VAR_INT) - 1);
             }
         });